Agent Verification Utility

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Deterministic JSON checks with signed evidence and x402-paid execution

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Agent Verification Utility": {
      "url": "https://agent-economy.kgninja.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (5)

• describe_verify_evidence read-only

  Describe when deterministic verification is useful, when it is not, free request validation, recipes, limits, and the explicit paid MCP path.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_revenue_goal_status read-only

  Read the active revenue goal, measured funnel, contribution margin, and the next bounded improvement recommendation. This tool never changes price, spends funds, or sends messages.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• quote_verify_evidence

  Obtain a free bound quote for deterministic checks on supplied JSON before deciding to purchase. After a successful free precheck at POST /validate-request, supply the unchanged intent and its precheck_receipt.receipt_digest. Creates or reuses a persisted quote and records observability events; no payment, signing or paid verification is performed. The bound quote ties request/evidence digests, precheck digest, spend policy, quoted amount, network, asset, recipient and expiry together. Server availability, fresh cost basis and conservative contribution-margin thresholds must pass. Returns the quote as JSON text and structuredContent: quote_id, request_hash, price (atomic USDC, 6 decimals), expires_at, economic_guard, purchase instructions and paid_verification_binding in state quoted, not a paid receipt. Application failures return isError=true with JSON error.code, message, retryable and optional details (for example PRECHECK_STALE, PRICE_CAP_EXCEEDED, IDEMPOTENCY_KEY_CONFLICT, IDEMPOTENCY_KEY_EXPIRED or UNPROFITABLE_TRANSACTION); invalid argument shapes are rejected by MCP schema validation. Re-run precheck after request/policy changes; do not pay on refusal. Next use prepare_verify_evidence_purchase with the same key and intent for the HTTP purchase request, or explicitly authorize the separate paid verify_evidence flow.

  Parameters:

  • idempotency_key (required) — string — Required 16-128 characters from A-Z, a-z, 0-9, underscore or hyphen. Reuse with the unchanged intent to reuse an unexpired quote; changed bindings return IDEMPOTENCY_KEY_CONFLICT. An expired key returns IDEMPOTENCY_KEY_EXPIRED; use a new key.
  • intent (required) — object — Required prechecked purchase intent: request, spend_policy and precheck_receipt_digest are all required, with no defaults or optional fields. Preserve the request and policy used in the successful free POST /validate-request.

  Hints: read-only no · destructive no · idempotent yes · open-world no

• prepare_verify_evidence_purchase

  Prepare an HTTP purchase request for deterministic JSON verification after a successful free precheck; a prior quote tool call is optional. After a successful free precheck at POST /validate-request, supply the unchanged intent and its precheck_receipt.receipt_digest. Creates or reuses a persisted quote and records observability events; no payment, signing or paid verification is performed. The bound quote ties request/evidence digests, precheck digest, spend policy, quoted amount, network, asset, recipient and expiry together. Server availability, fresh cost basis and conservative contribution-margin thresholds must pass. Returns JSON text and structuredContent containing quote, request (POST /verify-evidence, content-type and X-Quote-ID headers, unchanged intent body), expected_first_status=402 and expected_payment_header=PAYMENT-REQUIRED. It does not send this request. Application failures return isError=true with JSON error.code, message, retryable and optional details (for example PRECHECK_STALE, PRICE_CAP_EXCEEDED, IDEMPOTENCY_KEY_CONFLICT, IDEMPOTENCY_KEY_EXPIRED or UNPROFITABLE_TRANSACTION); invalid argument shapes are rejected by MCP schema validation. Re-run precheck after request/policy changes; do not pay on refusal. Next send the returned request to obtain a challenge, check binding, amount, network, asset, payTo and expiry against local policy, then authorize payment separately. Use quote_verify_evidence when only quote terms are needed.

  Parameters:

  • idempotency_key (required) — string — Required 16-128 characters from A-Z, a-z, 0-9, underscore or hyphen. Reuse with the unchanged intent to reuse an unexpired quote; changed bindings return IDEMPOTENCY_KEY_CONFLICT. An expired key returns IDEMPOTENCY_KEY_EXPIRED; use a new key.
  • intent (required) — object — Required prechecked purchase intent: request, spend_policy and precheck_receipt_digest are all required, with no defaults or optional fields. Preserve the request and policy used in the successful free POST /validate-request.

  Hints: read-only no · destructive no · idempotent yes · open-world no

• verify_evidence

  Run deterministic checks and return Ed25519-signed evidence after one explicitly authorized x402 payment. A free precheck receipt and a matching bound payment requirement are required before signing.

  Parameters:

  • idempotency_key (required) — string
  • intent (required) — object

  Hints: read-only no · destructive no · idempotent yes · open-world yes

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